Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX4003EUA+

General Description

The MAX4003 low-cost, low-power logarithmic amplifier

is designed to detect the power levels of RF power

amplifiers (PAs) operating from 100MHz to 2500MHz. A

typical dynamic range of 45dB makes this logarithmic

amplifier useful in a variety of wireless applications

including cellular handset PA control, TSSI for wireless

terminal devices, and other transmitter power measure-

ments. This logarithmic amplifier provides much wider

measurement range and superior accuracy than typical

diode-based detectors. Excellent temperature stability is

achieved over the full operating range of -40°C to +85°C.

The MAX4003 logarithmic amplifier is a voltage-mea-

suring device with a typical signal range of -58dBV to

-13dBV. The input signal is internally AC-coupled by an

on-chip 5pF capacitor in series with a 2kΩ resistance.

This highpass coupling, with a corner at 16MHz, sets

the lowest operating frequency and allows the input

signal source to be DC grounded. The MAX4003 also

features a power-on delay, which holds the detector

output (OUT) low for approximately 5µs to ensure

glitchless controller output.

The MAX4003 is available in an 8-bump chip-scale pack-

age (UCSP™), an 8-pin µMAX package, and an 8-pin thin

QFN package. The device consumes 5.9mA with a 3.0V

supply and only 13µA when the device is in shutdown.

Applications

Cellular Handsets (TDMA, CDMA, GPRS, GSM)

TSSI for Wireless Terminal Devices

Transmitter Power Measurement and Control

RSSI for Fiber Modules

Features

♦ Complete RF Detector

♦ Frequency Range from 100MHz to 2500MHz

♦ Input Range of -58dBV to -13dBV

(-45dBm to 0dBm into 50Ω)

♦ Fast Response: 70ns in 10dB Steps

♦ Low-Current Consumption: 5.9mA at V

= 3.0V

♦ 13µA (typ) Shutdown Current

♦ Available in 8-Bump UCSP or 8-Pin µMAX and

Thin QFN Packages

MAX4003

100MHz to 2500MHz, 45dB RF Detector

in a UCSP

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

10dB

DET

10dB 10dB10dB

DET

DET DETDET

OFFSET

COMP

LOW-

NOISE

BANDGAP

OUTPUT

ENABLE

DELAY

GND

V-I

RFIN

SHDN

OUT

CLPF

MAX4003

Functional Diagram

19-2620; Rev 1; 3/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN/BUMP-

PACKAGE

TOP

MARK

MAX4003EBL-T

-40°C to +85°C

8 UCSP-8 ABV

MAX4003EUA

-40°C to +85°C

8 µMAX —

MAX4003ETA-T

-40°C to +85°C8 Thi n QFN - E P

ADG

Pin Configurations

MAX4003

OUT

N.C.

GND

CLPF

123

GND

RFIN

µMAX

SHDN

RFIN GND

CLPF

OUT GND

SHDN

MAX4003

UCSP

TOP VIEW

(BUMPS ON BOTTOM)

TOP VIEW

UCSP is a trademark of Maxim Integrated Products, Inc.

Pin Configurations continued at end of data sheet.

EVALUATION KIT

AVAILABLE

Summary of content (12 pages)

PAGE 1
9-2620; Rev 1; 3/03 KIT ATION EVALU E L B A AVAIL 100MHz to 2500MHz, 45dB RF Detector in a UCSP Features The MAX4003 low-cost, low-power logarithmic amplifier is designed to detect the power levels of RF power amplifiers (PAs) operating from 100MHz to 2500MHz. A typical dynamic range of 45dB makes this logarithmic amplifier useful in a variety of wireless applications including cellular handset PA control, TSSI for wireless terminal devices, and other transmitter power measurements.
PAGE 2
MAX4003 100MHz to 2500MHz, 45dB RF Detector in a UCSP ABSOLUTE MAXIMUM RATINGS VCC to GND .........................................................-0.3V to +5.25V SHDN, CLPF to GND..................................-0.3V to (VCC + 0.3V) RFIN..................................................................................+6dBm OUT Short Circuit to GND.......................................................10s Continuous Power Dissipation (TA = +70°C) 8-Bump UCSP (derate 4.7mW/°C above +70°C).........
PAGE 3
100MHz to 2500MHz, 45dB RF Detector in a UCSP (VCC = 3.0V, V SHDN = VCC, CCLPF = 0.1µF, fRF = 100MHz to 2500MHz, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL RF Input Frequency Range fRF RF Input Voltage Range VRF Equivalent RF Input Power Range PRF Logarithmic Slope CONDITIONS MIN MAX UNITS 100 2500 MHz (Note 2) -58 -13 dBV With 50Ω termination (Note 2) -45 0 dBm fRF = 100MHz, TA = +25°C 22.8 fRF = 100MHz 22.
PAGE 4
Typical Operating Characteristics (continued) (VCC = V SHDN = 3.0V, CCLPF = 0.1µF, TA = +25°C, unless otherwise noted.) 0.9GHz VOUT (V) ERROR (dB) 1.8 1.6 3 1.6 3 1.4 2 1.4 2 1.2 1 1.2 1 0 -1 0 1.0 TA = +85°C 0.8 -2 0.6 -3 0.8 -2 0.6 -3 0.4 -4 10 0.2 TA = -40°C 0.4 -4 0.
PAGE 5
100MHz to 2500MHz, 45dB RF Detector in a UCSP 28 TA = -40°C 29 TA = +85°C 28 27 26 26 25 25 TA = +25°C 29 1.9GHz 28 27 0.9GHz 26 25 0.1GHz 24 1.0 1.5 2.0 2.5 0 0.5 FREQUENCY (GHz) 2.5 2.5 29 1.9GHz 0.1GHz -53 TA = +85°C -54 TA = +25°C -55 TA = -40°C -56 3.5 4.0 4.5 5.0 -57 -58 TA = +25°C -59 TA = +85°C TA = -40°C 0 5.5 0.5 1.0 1.5 2.0 0 0.5 1.0 1.5 2.0 FREQUENCY (GHz) FREQUENCY (GHz) LOG INTERCEPT vs. SUPPLY VOLTAGE (µMAX) LOG INTERCEPT vs.
PAGE 6
Typical Operating Characteristics (continued) (VCC = V SHDN = 3.0V, CCLPF = 0.1µF, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SHUTDOWN VOLTAGE 1500 6 -200 5 -300 -400 1000 -500 -600 R 500 0 0.5 1.0 1.5 2.0 3 2 1 -700 0 -800 -1 2.5 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 FREQUENCY (GHz) VSHDN (V) POWER-ON RESPONSE TIME POWER-DOWN RESPONSE TIME MAX4003 toc24 0 4 MAX4003 toc25 RESISTANCE (Ω) FREQUENCY (GHz) R JXΩ 0.1 1916 -839 0.9 909 -125 1.9 228 -48 2.
PAGE 7
100MHz to 2500MHz, 45dB RF Detector in a UCSP MINIMUM OUTPUT VOLTAGE vs. SUPPLY VOLTAGE MAX4003 toc28 0.41 fRF = 900MHz, PRFIN = -50dBm ILOAD = 0mA, 5mA, 10mA 0.40 0.39 500 0.38 450 VOUT (mV) VOUT (V) fRF = 900MHz 100mVP-P 550 MAX4003 toc29 SMALL-SIGNAL STEP RESPONSE (CCLPF = 150pF) 0.37 0.36 0.35 400 350 0.34 300 0.33 250 0.32 2.5 3.0 3.5 4.0 4.5 5.0 5.
PAGE 8
100MHz to 2500MHz, 45dB RF Detector in a UCSP MAX4003 Pin Description PIN NAME DESCRIPTION µMAX/ Thin QFN UCSP 1 A1 RFIN 2 A2 SHDN 3, 5 A3, C3 GND Ground. Connect to PC board ground plane. 4 B3 CLPF Lowpass Filter Connection. Connect external capacitor between CLPF and GND to set the control-loop bandwidth. 6 — N.C. No Connection. Leave this pin unconnected or connect to GND. 7 C2 OUT Detector Output. Connect this buffer output to baseband ADC. VCC Supply Voltage.
PAGE 9
100MHz to 2500MHz, 45dB RF Detector in a UCSP Waveform Considerations Although the input level of the MAX4003 is specified in dBm, the logarithmic amplifier actually responds to rectified voltage signals rather than a true RMS power. It is important to realize that input signals with identical rootmean-square power but with unique waveforms result in different logarithmic outputs. Differing signal waveforms result in either an upward or downward shift in the logarithmic intercept.
PAGE 10
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 4X S 8 E Ø0.50±0.1 8 INCHES DIM A A1 A2 b H c D e E H 0.6±0.1 1 L 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6° 0° 0.0207 BSC 8LUMAXD.
PAGE 11
100MHz to 2500MHz, 45dB RF Detector in a UCSP 6, 8, &10L, DFN THIN.EPS COMMON DIMENSIONS PACKAGE VARIATIONS SYMBOL MIN. MAX. PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e A 0.70 0.80 T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF D 2.90 3.10 T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF E 2.90 3.10 T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF A1 0.00 0.05 T1033-1 10 1.50±0.10 2.30±0.
PAGE 12
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 9LUCSP, 3x3.EPS MAX4003 100MHz to 2500MHz, 45dB RF Detector in a UCSP PACKAGE OUTLINE, 3x3 UCSP 21-0093 K 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.